fetch-parts

Arguments: mailbox messages parts &key uid

This function retrieves the specified parts of
the specified messages. If
uid is true then the
messages are considered to be unique ids rather
than message sequence numbers. The description of what can be
specified for parts is quite complex. It is
described in detail in Fetching a Letter in
imap.htm.

The return value from this function is a structure that can be examined
with fetch-field.

When the result returned includes an envelope value the following
functions can be used to extract the components of the envelope: